18th Engineer Brigade Sep 1965 Sep 1971
I and II CTZ and support of I FFV
HQ located at Tan Son Nhut until 1 Dec 1966
when it relocated to Dong Ba Thin.
35th Engineer Group Jun 1965 Nov 1971.
HQ located at Phan Rang until Apr 1966,
when it moved to Cam Ranh Bay; it was at
Qui Nhon JulDec 1968 and then returned
to Cam Ranh Bay.
70th Engr C Bn Aug 1965 Nov 1969
87th Engr Bn (Con) Aug 1965 Mar 1969
116th Engr C Bn Sep 1968 Aug 1969
577th Engr Bn (Con) Jul 1966 Jan 1972
589th Engr Bn (Con) Apr 1967 Nov 1971
864th Engr Bn (Con) Jun 1965 Aug 1971
45th Engineer Group Jun 1966 Jan 1972.
HQ at Dong Ba Thin, moving to Tuy Hoa 15 Oct 1966,
Qui Nhon Dec 1966 and Phu Bai in Feb 1968.
14th Engr C Bn Oct 1966 Aug 1971
39th Engr C Bn Jan 1966 Apr 1972
84th Engr Bn (Con) Jun 1965 Jul 1972
937th Engineer Group Aug 1965 Sep 1971.
HQ at Qui Nhon, moving to Pleiku Nov 1966 and
Phu Tai 10 Mar 1970. This was the only engineer
group with (Combat) in its title; the others
were all (Construction) although all had a mix
of combat and construction battalions assigned.
19th Engr C Bn Sep 1965 Dec 1970
20th Engr C Bn Jan 1966 Aug 1971
299th Engr C Bn Oct 1965 Nov 1971
815th Engr Bn (Con) Apr 1967 Jan 1972
20th Engineer Brigade Aug 1967 Sep 1971
III and IV CTZ and support of II FFV
HQ located at Bien Hoa.
34th Engineer Group Mar 1967 Mar 1972.
HQ at Vung Tau, moving to Bin Thuy Feb 1969.
27th Engr C Bn Oct 19666 Jan 1972
35th Engr C Bn Nov 1966 Sep 1970
36th Engr Bn (Con) Sep 1967 Apr 1972
69th Engr Bn (Con) May 1967 Nov 1971
93rd Engr Bn (Con) Jun 1967 Jul 1971
79th Engineer Group Jul 1966 Dec 1970.
HQ initially at Phan Rang, moving to
Long Binh Oct 1966.
86th Engr C Bn Oct 1966 Aug 1969
168th Engr C Bn Nov 1965 Apr 1970
554th Engr Bn (Con) Apr 1967 Mar 1972
588th Engr C Bn Nov 1965 Nov 1970
159th Engineer Group Oct 1865 Apr 1972.
HQ at Bien Hoa, moving to Long Binh Jul 1966.
34th Engr Bn (Con) May 1967 Oct 1971
46th Engr Bn (Con) Sep 1965 Nov 1971
62nd Engr Bn (Con) Aug 1965 Nov 1971
92nd Engr Bn (Con) May 1967 May 1972
169th Engr Bn (Con) May 1966 Apr 1972
HQ 921st Engineer Group was in Vietnam 1 Oct 1966
to 25 May 1968, but never operated as a command
organization; it served to help staff U.S. Army
Engineer Command (Provisional) and then served
as a sort of holding unit until closed.